Improvement in sectional steam-boilers



UNITED i STATES PATENT EFIGE.

AWILLIAM II. o-onNELL, or EASTON, PENNSYLVANIA.

IMPROVEMENT IN SECTIONAAL STEAM-BOILERS..

Specification forming part of Letters Patent No. 113,857. datcd`April 18, 1871.

I, WILLIAM H. CORNELL, of Easton, Northampton county, State of Pennsylvania, have invented an Improved Sectional Steam-Boiler, of which the following is a speciication:

Nature and Object of the Intention.

leave the boiler in a comparatively dry state.,

Description of the Accompanying Drawing.

Figure l is a front perspective view of my improved sectional steam-boiler; Fig. 2, a longitudinal section of the same on the line l 2, Fig. l; Fig. 3, a longitudinal section on the line 3 4, Fig. l; Figs. 4 and 5, detached views drawn to an enlarged scale; and Fig. 6, a transverse sectional view ot' a slightly-modiiied form of boiler, with a portion of thefurnace.

General Description.

The boiler consists of a number of horizontal or slightlyinclined wrought-iron tubes, A, each of which is connected at one end to one of a series of inclined cast-iron boxes, B, and at its opposite end to one of a series ot' similar boxes, B', inclined in a direction contrary to that of the boxes B.

The inclined boxes of each series are in contact with, but are entirely separate and disconnected from, each other, so that they may expand and contract independently. Free communication, however, is established between all ot' the boxes of both series, but in an indirect manner, by means of the connecting-tubes.

I adapt each end of each tube to an opening, a, formed for its reception in the inner shell, c, of its box B or B', and then swagc or expand the end of the said tube, in the manner plainly shown in Figs. 2, 8, 4, and 5, so

that it may overlap the edges of the opening a, through which it is passed. This swaging is effected by means of an expanding-tool, which is inserted through an opening, a', formed in the outer shell, d, of the end box, at a point directly opposite the end of the tube, the said opening, after the swaging of the tube, being closed by a screwplug, j', which can be readily removed when access has to be obtained to the interior of the boiler for purposes of cleansing or repairs.

I have ascertained by practical experience that for this forni of boiler the swaged joints at the ends of the tubes are less liable to leak than either threaded or packed joints.

I prefer, for convenience in arranging the boiler within a furnace, that the end boxes should be of di'ereut lengths, as shown in Fig. l or in Fig. 6; but the said boxes might be all of the same length, as indicated by the dotted lines a: .r in Fig. l, providing only that their inclined or diagonal arrangement was retained.

The advantages arising from the peculiar arrangement of the tubes and inclined boxes which constitute the boiler will be best un derstood by referring to Fig. 6, where it will be seen that the tubes, instead of being arranged in` horizontal rows and one directly above the other, which would be the case it the boxes at one end were horizontal and those at the other end vertical, are alternated or staggered, (owing to the inclination ot' the boxes,) so that the heated products of combustion, in passing upward, must impinge against and envelop the tubes instead of passing upward freely between them.

It will be evident that a greater percentage ofthe heat is utilized by this arrangement than in ordinary boilers of this class.

Another great advantage arising from the inclination of the end boxes, when used in` connection with the horizontal or slightly-inclined tubes, is that the lowermost tubes are not in direct communication with the upper or steam tubes, but are connected with the same through several intervening boxes and tubes. This insures a complete circulation within the boiler of the heated water and steam; but, owing to the circnitous course and the constant changing of the direction ot' is separated from the water and. passes Vfrom to .this specification in the presence of two the currents, lthe steamin its upward; passage' 1 In testimony lWhereofI have signed my name the boiler iu a comparatively dry starte. subscribing Witnesses.

. 01mm- WM. H. CORNELL. A sectional steam-boiler consisting of tubes. A, connected et one end 'to independent 'in- Witnesses: clined boxes B, and at the opposite end to n- S. MOORE, dependent boxes Bf, inclined in a direction? A. K. MICHLER. contra-ry to that of the said boxes B. 

